`@backstage/backend-common` is a common functionality library for backends for Backstage, an open platform for building developer portals. In `@backstage/backend-common` prior to versions 0.21.1, 0.20.2, and 0.19.10, paths checks with the `resolveSafeChildPath` utility were not exhaustive enough, leading to risk of path traversal vulnerabilities if symlinks can be injected by attackers. This issue is patched in `@backstage/backend-common` versions 0.21.1, 0.20.2, and 0.19.10.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| @backstage/backend-common(npm) | 0.21.0 | 0.21.1 | N/A |
| @backstage/backend-common(npm) | 0 | 0.19.10 | N/A |
| @backstage/backend-common(npm) | 0.20.0 | 0.20.2 | N/A |
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